| Question About Phone Wiring I live in an apartment building built in the early 80s so the phone wiring in here isn't great. I have done my best to clean up the jacks and wires and I have seen some improvement in my stats.
However, I just had one question about the wiring in here. Most of the jacks are wired in normal fashion i.e. red to red, green to green etc.
There is one jack in the living room that is different than the others - it has the red, green, black and yellow wires, but it also has three extra really thin, greyish wires which i have no clue what they do (also very difficult to strip). If I don't connect two of the thin wires to anything the phone line goes dead. At the moment I have one thin wire connected to the red wire coupling, and the other thin wire to the green wire coupling. The third thin wire isn't connected to anything.
My guess is these are some kind of power wires and the third being a ground?
The line is working fine at the moment, but maybe if someone has any insight on the function of these three wires, and if there is a way to connect them properly to improve line quality. |
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| Pics? I've worked on phone lines in hundreds of apartments and have no idea what you are talking about.
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| reply to monsoon66
Phone wiring does not have "power wires", the signal pair has a nominal 48VDC open-loop voltage on it, that is the only power basic phones need and it has been that way for 30+ years.
What you may be messing with there could be the riser cable from which phone service to each apartment branches off of... but in that case, there should be over a dozen wires in there, possibly simply just not in view. |
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| Typical Bell plant voltage is -51 volts. And there is no power wires as InvalidError states.
Some remotes have a -27 volt open loop voltage.
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| reply to monsoon66
The thin wires, usually come in a bundle of 4 or more, are feeds from demarcation point. They are not meant to be stripped and twisted/wrapped as normal electrical wires. They are usually inserted in a split of a clip on a punchdown block. The sharp edges of the split will strip the plastic and make the electrical connections with the wires. All the wires in the same row will be connected electrically. In a stable moisture and temperature environment, this kind of connection should provide good quality electrical signal for the phone line.
On a side note, the red wire (called "ring") is ground, the green wire ("tip"), when on hook, is about -47VDC to -51VDC as someone has mentioned. When you pick up the handset, it will drop to about -7 to -5VDC depending on how far your are from Bell's central office. These voltages are fed from Bell's battery in the CO. |
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